2 . HOW TO USE VARIABLES AND COMMENTS IN PYTHON

 

•  VARIABLES AND COMMENTS IN PYTHON: 

• COMMENTS IN PYTHON :

Why Commenting Your Code Is So Important

Comments are an integral part of any program. They can come in the form of module-level docstrings, or even inline explanations that help shed light on a complex function.

Before diving into the different types of comments, let’s take a closer look at why commenting your code is so important.

Consider the following two scenarios in which a programmer decided not to comment their code.

When Reading Your Own Code:

Client A wants a last-minute deployment for their web service. You’re already on a tight deadline, so you decide to just make it work. All that “extra” stuff—documentation, proper commenting, and so forth—you’ll add that later.

The deadline comes, and you deploy the service, right on time. Whew!

You make a mental note to go back and update the comments, but before you can put it on your to-do list, your boss comes over with a new project that you need to get started on immediately. Within a few days, you’ve completely forgotten that you were supposed to go back and properly comment the code you wrote for Client A.

Fast forward six months, and Client A needs a patch built for that same service to comply with some new requirements. It’s your job to maintain it, since you were the one who built it in the first place. You open up your text editor and…

What did you even write?!

You spend hours parsing through your old code, but you’re completely lost in the mess. You were in such a rush at the time that you didn’t name your variables properly or even set your functions up in the proper control flow. Worst of all, you don’t have any comments in the script to tell you what’s what!

Developers forget what their own code does all the time, especially if it was written a long time ago or under a lot of pressure. When a deadline is fast approaching, and hours in front of the computer have led to bloodshot eyes and cramped hands, that pressure can be reflected in the form of code that is messier than usual.

Once the project is submitted, many developers are simply too tired to go back and comment their code. When it’s time to revisit it later down the line, they can spend hours trying to parse through what they wrote.

Writing comments as you go is a great way to prevent the above scenario from happening. Be nice to Future You!

Python Commenting Basics :

Comments are for developers. They describe parts of the code where necessary to facilitate the understanding of programmers, including yourself.

To write a comment in Python, simply put the hash mark # before your desired comment:

# This is a comment

Python ignores everything after the hash mark and up to the end of the line. You can insert them anywhere in your code, even inline with other code:

print("This is banana.")  # This won't run

Another thing you can do is use multiline strings by wrapping your comment inside a set of triple quotes:
"""
If I really hate pressing `enter` and
typing all those hash marks, I could
just do this instead
"""


VARIABLES IN PYTHON :
What is a Variable in Python?
A Python variable is a reserved memory location to store values. In other words, a variable in a python program gives data to the computer for processing.
Python Variable Types
Every value in Python has a datatype. Different data types in Python are Numbers, List, Tuple, Strings, Dictionary, etc. Variables in Python can be declared by any name or even alphabets like a, aa, abc, etc.

How to Declare and use a Variable
Let see an example. We will define variable in Python and declare it as "a" and print it.
a=100 
print (a)
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